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Overshot tool for retrieving an object in a well and methods of use therefor

a technology for retrieving objects and wells, applied in the direction of wellbore/well accessories, fluid removal, sealing/packing, etc., can solve the problems of affecting the production efficiency affecting the quality of overshot fishing tools, so as to achieve the effect of convenient manufacture and effective and efficient retrieval of objects

Active Publication Date: 2009-08-25
BAKER HUGHES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention is an overshot tool for retrieving objects in a well. The tool has a housing with a cam and a cam axis. The cam is rotatable relative to the housing. The tool is lowered into the well with the cam in an aligned position with the lower portion of the housing. The cam is then rotated to a misaligned position where the cam axis is parallel and offset from the lower portion of the housing. The tool is then used to grip and retrieve the object in the well. The technical effects of the invention include improved grip and easier retrieval of objects in wells.

Problems solved by technology

It is common for objects, such as a segment of a pipe, to become stuck or forcibly lodged within a wellbore.
Such overshot fishing tools are known in the art; however, most of these known overshot fishing tools cannot retrieve a wide range of different sized fish.
Currently, most known overshot fishing tools cannot retrieve fish having a variation in size of more than 0.06 inch.

Method used

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  • Overshot tool for retrieving an object in a well and methods of use therefor
  • Overshot tool for retrieving an object in a well and methods of use therefor
  • Overshot tool for retrieving an object in a well and methods of use therefor

Examples

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Embodiment Construction

[0021]Referring to FIGS. 1-4, overshot tool 10 is shown in its unset position, i.e., the position at which overshot tool 10 is run or lowered into a well prior to securing the fish (not shown). Overshot tool 10 includes cylindrical housing 12 having upper end 13 having threads (not shown) or other structure to facilitate attaching upper end 13 to a string of conduit, such as drill pipe or coiled tubing, for lowering or running overshot tool 10 into a well, for raising or removing overshot tool 10 from the well, and, in one particular embodiment, for rotating housing 12. Housing 12 is a tubular member, preferably having a cylindrical outer diameter.

[0022]Overshot tool 10 also includes lower end 14 having opening 15 of housing bore 18. Housing bore 18 has a lower portion 22 that is cylindrical but offset or eccentric relative to the cylindrical outer diameter of housing 12. Preferably, opening 15 is conical or flared. Because bore 18 is offset, flared opening portion 15 has a height t...

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PUM

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Abstract

An overshot tool for retrieving an object in a well includes a housing having a housing bore with upper and lower portions. A cam having a cam bore is carried in the upper portion of the bore. The housing and the cam are rotatable relative to each other from an aligned position, in which the cam bore axis and the housing bore lower portion axis coincide, to a misaligned position, in which the cam bore axis and the housing bore lower portion axis are misaligned with each other. The housing bore and the cam bore are open at a lower end for sliding over an object in the well when the tool is in the aligned position. Rotation of the housing and the cam relative to each other causes the cam bore axis and the lower portion axis to move toward the misaligned position, thereby gripping the object for retrieval.

Description

BACKGROUND[0001]1. Field of Invention[0002]The invention is directed to tools for retrieving an object disposed in the bore of a well, and in particular, to overshot fishing tools.[0003]2. Description of Art[0004]It is common for objects, such as a segment of a pipe, to become stuck or forcibly lodged within a wellbore. Tools for retrieving an object disposed in the bore of well are well known. These tools are known in the art as fishing tools. One type of fishing tool is known as an overshot fishing tool because the tool encases the object, or fish, disposed within the bore of the well. Such overshot fishing tools are known in the art; however, most of these known overshot fishing tools cannot retrieve a wide range of different sized fish. Currently, most known overshot fishing tools cannot retrieve fish having a variation in size of more than 0.06 inch.[0005]Accordingly, overshot fishing tools capable of retrieving a wide range of different sized fish, and methods of retrieving an...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): E21B31/00
CPCE21B31/18
Inventor FAY, PETER J.
Owner BAKER HUGHES INC
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